Ernst sciimitz



(No Model.)

E. SGHMITZ.

RATOHET DRILL.

No. 452,985. Ftgj Patented May 26, 1891.

ML, M

with/M000 I I aww nltoz J x- 45. M0 I 5 NIETED STATES ATENT rnrcni ERNST SCHMITZ, OF CHICAGO, ILLINOIS, ASSIGNOR TO EDWARD MELCHIOR, OF SAME PLACE.

RATCHET-DRILL.

SPECIFICATION forming part of Letters Application filed December 12, 1890.

T or whom it may concern.-

Be it known that I, ERNST SOHMITZ, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois,

have invented certain new and useful Improvements in Ratchet-Drills, which are fully set forth in the following specification, reference being had to the accompanying drawings, forming a part hereof, and in which Figure 1 shows my improved ratchet-drill as seen in plan View on its upper end and in closed or working condition of the parts, the broken lines showing their position when the lever c and clamp or band 6 are moving backward or are open. Fig. 2 shows Fig. 1 in side view with part of the cylinder which holds the drill broken away.

Like letters refer to like parts.

The object of my invention is to improve the construction of ratchet-drills by substituting for the common ratchet and pawl a simpler and more efficient device 5 and to attain said desirable ends I construct my improved ratohet-drill in substantially the following manner, namely: On the smooth cylinder a I put an open band 1). Said band may be made of any metal having sufficient elasticity to spring back from its close embrace of the cylinder when released and which may be made thinner between its open ends, as shown in the drawings. One of the ends of said band is formed into a loop 6 and the opposite end into a hook or lug b nearly at right angles with the end of the band, so that the outer end of said lug or hook is turned back toward the band, sub stantially as it is shown in the drawings. To the loop end of said band I attach a lever c, which has two rigid arms or lugs, which pass 40 over the edges of theloop b, and through said arms and loop passes a bolt bi, upon which said lever is hinged to move freely. The end of said lever between said arms is formed into a hook or finger c with a round point, which engages with the hook Z) of said band in the form and position as clearly shown in Fig. 1. A drill-center a of the usual form is placed on the cylinder to opposite the drill. From the foregoing it will be observed that Patent No. 452,985, dated May 26, 1891.

Serial No. 374,459. (No model.)

the novel parts of my device are the band b, lever c, and the construction and uniting of their ends adapted to work 011 any cylindrical bod ya.

The mode of operation of my said new device is substantiallyas follows, namely: The 5 5 band I) may fit loosely on the smooth. cylinder a or its ends may be made to spring out from it slightly, as shown by the broken out lines. hen the lever c is actuated in the direction from the broken and the full lines, the hook c presses on the lug b and thus throws the ends of the band I) nearer together. This causes the said band to embrace the cylinder a with great force and friction, whereby it may be made to turn the cylinder or against any resistance, however great, that may be thrown on it, and its strength overcome without permitting the said band to slip, even though it be most thoroughly lubricated, while at the same time only a scarcelyperceptible motion is given to the free ends of said band. It is obvious, therefore, that only a very slight reverse motion is necessary to allow the band to slip backward, and that by working said lever recip- 7 5 rocally, as in any ordinary ratchetdrill, the same rotary motion of the drill is obtained, and that said rotary motion may be made in either direction by simply reversing the edges of said band on said cylinder. It is also ob- 8o vious that my said new construction of band and lever may be applied to turn any cylindrical body.

hat I claim is 1.- The combination, with the continuous annular open and elastic band Z2, having the loop b and hook 72 of the lever provided with rigid arms hinged to said loop 6', provided with a hook 0, adapted to engage with the hook end 19 of said band and bring its free ends together, substantially as specified.

2. In a ratchet-drill, the combination, with the cylinder a and single open-end and clas tic band b, having loop b and hook 71 of the rigid armed and hinged lever provided with 5 a hook 0, adapted to engage with the hook I) and bring the free ends of said band together, substantially as specified.

3. In a ratchet-drill, the combination, with the free ends of said band toward each other, the amitllar open and elastic band b, having substantially as specified. a loop at one of its open ends and a hook T L r b on the other end, of the lever 0, provided ERA S1 SOHMITA' with rigid lugs and a hook c, and a pin b Witnesses: whereby said band and lever are hinged to- WM. ZIMMERMAN, gether and by their action adapted to draw V. J. TAYLOR. 

